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Measurements on surface current drift off Oregon and Washington were made in March 1964 through February 1966 with plastic drift cards dropped from Coast Guard planes at selected points. Results show pronounced surface drift to the north in winter and to the south in spring, each drift associated with a strong wind flow. From April to late in the fall the drift is variable; during this period drift cards were returned showing surface drift opposite to wind flow, indicating that wind direction and intensity are not necessarily indications of surface current flow.
This volume brings together recent primary source materials on major themes in Hawaiian natural history: the geological processes that have built the Islands; the physical factors that influence the Island's terrestrial ecosystems; the dynamics of the sea that support coral reefs, fish, and mollusks; the peculiarities of animals and plants that have evolved in the Islands and are found nowhere else; and the human impact on the land, plants, and animals.